Source locations from Core

[Erdi, Gergo]

PUBLIC

Hi,

I'm looking for ways to map Core fragments back to source locations.

I see there is an annotated version of Core in `GHC/Core.hs` called `AnnExpr`, which I could see being useful for this if I set the annotation type to `SrcSpan`, but that's not what I get out of GHC's desugarer, simplifier or tidier.

If there's no built-in mechanism for this, my only idea would be to create a HsExpr-to-HsExpr transformation that wraps every node in a call that is opaque enough to be persisted through Core-to-Core transformations but still transparent enough that it doesn't block optimization opportunities. Is that even possible?

Alternatively, would it make it easer if I was content with only getting source locations for variable occurrences?

Thanks,
           Gergo

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